Functional sheet for delivering laundry actives in low-temperature water

Abstract

Disclosed is a washing method using a functional sheet, the method comprising; adding the functional sheet to a washing medium at a rinsing step of washing process; wherein the washing medium contains a rinsing water of 0° C. to 30° C. and a second substrate; wherein the functional sheet comprises; a first substrate; and an active ingredient applied on or impregnated into the first substrate, wherein the active ingredient has at least one material selected from the group consisting of a softener, an aromatic agent, an antistatic agent, a stabilizer, a colorant, a preservative, an optical brightener, and a bleaching agent; wherein the active ingredient, which is released from the first substrate and dispersed into the rinsing water, is to be physically or chemically adsorbed onto the second substrate in the rinsing water, and remains on the second substrate after removal of the rinsing water.

1 . A washing method using a functional sheet, the method comprising;
 adding the functional sheet to a washing medium at a rinsing step of washing process;   wherein the washing medium contains a rinsing water of 0° C. to 30° C. and a second substrate;   wherein the functional sheet comprises   a first substrate; and   an active ingredient applied on or impregnated into the first substrate, wherein the active ingredient has at least one material selected from the group consisting of a softener, an aromatic agent, an antistatic agent, a stabilizer, a colorant, a preservative, an optical brightener, and a bleaching agent;   wherein the active ingredient, which is released from the first substrate and dispersed into the rinsing water, is to be physically or chemically adsorbed onto the second substrate in the rinsing water, and remains on the second substrate after removal of the rinsing water; and   wherein the first substrate has a water contact angle of 90° or less, so that 70% or more of the active ingredient applied on or impregnated into the first substrate is released in the rinsing water within 5 minutes.   
     
     
         2 . The washing method as claimed in  claim 1 , wherein the first substrate is a polymer sheet of which surface is treated with a hydrophilic emulsion, or is a sheet made of a hydrophilic polymer. 
     
     
         3 . The washing method as claimed in  claim 1 , wherein the first substrate has a water contact angle of 0°. 
     
     
         4 . The washing method as claimed in  claim 2 , wherein the hydrophilic emulsion is a hydrophilic silicon based surfactant. 
     
     
         5 . The washing method as claimed in  claim 2 , wherein the hydrophilic emulsion used for surface-treating the polymer sheet is used in an amount within a range of 0.01 to 20 parts by weight, with respect to 100 parts by weight of the first substrate. 
     
     
         6 . The washing method as claimed in  claim 1 , wherein the first substrate is a porous substrate. 
     
     
         7 . The washing method as claimed in  claim 2 , wherein the polymer sheet to be surface-treated is made of polyethylene, polypropylene, or polyethylene terephthalate. 
     
     
         8 . The washing method as claimed in  claim 1 , wherein the first substrate is a non-woven fabric or a woven fabric. 
     
     
         9 . The washing method as claimed in  claim 1 , wherein, even after the active ingredient is applied or impregnated, a pore structure is maintained. 
     
     
         10 . The washing method as claimed in  claim 1 , wherein the active ingredient is used in combination with an emulsifier or a dispersant. 
     
     
         11 . The washing method as claimed in  claim 10 , wherein content of the emulsifier is 50 parts by weight or less, with respect to 100 parts by weight of a total active ingredient. 
     
     
         12 . The washing method as claimed in  claim 1 , wherein the active ingredient is in a liquid state at 60° C. or more, and is in a solid state at 30° C. or less. 
     
     
         13 . The washing method as claimed in  claim 1 , wherein the active ingredient is impregnated or applied on the first substrate in an amount within a range of 0.1-20 mg/cm 2  per unit area of the first substrate. 
     
     
         14 . A washing method using a functional sheet, the method comprising;
 adding the functional sheet to a washing medium at a rinsing step of washing process;   wherein the washing medium contains a rinsing water of 0° C. to 30° C. and a second substrate;   wherein the functional sheet comprises   a first substrate; and   an active ingredient applied on or impregnated into the first substrate, wherein the active ingredient has at least one material selected from the group consisting of a softener, an aromatic agent, an antistatic agent, a stabilizer, a colorant, a preservative, an optical brightener, and a bleaching agent;   wherein, the active ingredient, which is released from the first substrate and dispersed into the rinsing water, is to be physically or chemically adsorbed onto the second substrate in the rinsing water, and remains on the second substrate after removal of the rinsing water; and   wherein the functional sheet has light transmittance ranging from 2 to 20%, so that 70% or more of the active ingredient applied on or impregnated into the first substrate is be released in the rinsing water at 0° C. to 30° C. within 5 minutes.   
     
     
         15 . The washing method as claimed in  claim 14 , wherein the first substrate is a porous substrate. 
     
     
         16 . The washing method as claimed in  claim 15 , wherein, even after the active ingredient is applied or impregnated, a pore structure is maintained. 
     
     
         17 . The washing method as claimed in  claim 14 , wherein the first substrate has light transmittance within a range of 20 to 50%. 
     
     
         18 . The washing method as claimed in  claim 14 , which comprises the active ingredient applied thereon in an amount within a range of 0.1-20 mg/cm 2  per unit area, and porosity with light transmittance within a range of 2-20%. 
     
     
         19 . The washing method as claimed in  claim 14 , wherein the active ingredient is used in combination with an emulsifier or a dispersant. 
     
     
         20 . The washing method as claimed in  claim 14 , wherein the active ingredient is in a liquid state at 60° C. or more, and is in a solid state at 30° C. or less. 
     
     
         21 . The washing method as claimed in  claim 14 , wherein the first substrate is polyethylene, polypropylene, or polyethylene terephthalate. 
     
     
         22 . The washing method as claimed in  claim 14 , wherein the first substrate is a non-woven fabric or a woven fabric.